<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<style>
    body{
        margin: 0;
        padding: 0;
    }
    canvas{
        width: 100%;
        height: 100%;
    }
</style>
<body>

</body>
<script src="https://cdn.bootcdn.net/ajax/libs/three.js/r128/three.js"></script>
<script src="js/index.js"></script>
</html>